Electrical testing apparatus.



No. 772,944. BATENTED 001' 25; 1904.

W. J. KYLE. ELEOTRIOAL'TESTING APPARATUS.-

APPLICATION FILED NOV. 19, 1902. no MODEL. 8 SHEETS-SHEET 1.

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mi Il W 7 No. 772,944. PATENTED OUT! 25, 1904.

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ELECTRICAL TESTING APPARATUS.

a APPLICATION FILED NOV. 19. 1902.

N0 MODEL. 3 SHEETS-SHEET 2.-

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WITNESSES:

N0. 772,944; PATENTED OGT.25,1904." I W. J. KYLE.

ELECTRICAL TESTING APPARATUS.

APPLICATION FILED NOV. 19, 1902.

N0 MODEL. 3 SHE ETS-SHEET 3.

WITNESSES INYENTOR: Z I

fl/m/w/ m UNITED STATES Patented. October 25, 1904. f

PATENT @FFICE.

WILLIAM JOSEPH KYLE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO KEYSTONE TELEPHONE COMPANY, OF PHILADELPHIA, PENNSYL- VANIA, A CORPORATION OF NEW JERSEY.

ELECTRICAL TESTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 772,944, dated October 25, 1904.

. Application filed November 19 1902. Serial No. 132,088- (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM JosErI-i KYLE, of No. 2116 South Sixty-fifth street, Philadelphia, Pennsylvania, have invented certain new and useful Improvements in Electrical Testing Apparatus, whereof the following is a specification, reference being had to the accompanying drawings.

My invention is particularly designed for identifying individual conductors in cables including a plurality of conductorsby charging a selected conductor with a current capable of producing a characteristic sound or tone in a telephone receiving instrument con- 5 neoted with that conductor. Such an operation is known as a tone test and is utilized in telephone practice in splicing cables, connecting up junction-boxes, and testing back to the cable-head in the telephone-exchange 2 from manholes or other stations on the line.

In the ordinary method of making such tone tests the testing-current is derived from an alternating-currentgenerator located at the exchange-station, and the tester at the distant 5 station, Where said current is to be applied to the selected wire, is supplied with said current through any convenient circuit, usually one of the wires of the cable being tested. Inxsuch case it is necessary for the tester at 3 the remote station to'first telephone to the eX-' change operator to connect said generator with one of the wires of the cable. Thetester must then determine which one of the several hundred wires. of the cable contains the supply-current by connecting a telephone-receiver to each wire in succession until the sup- Certain advantages incident to the employ- 6o ment of my invention may be noted as follows: The'waste of time hitherto necessary in establishing and maintaining a currentsupply circuit between the exchange-station and the testing-station is obviated. The tone- 5 current being produced under the direct control of the tester, the possibility of its supplycircuit being broken or disturbed without the knowledge of the tester is obviated, the testing-current being only required to traverse 7 the length of the wire which is to be tested and Without first traversing a supply-wire from the exchange-station to the testing-star. tion. The current generated in the portable apparatus may be so small as not to' create any disturbance or produce any noise in the wires of the cable other than the single wire being tested. Moreover, as hereinafterdescribed, the testing-current is an induced pulsatory direct current, capable of producing a much more distinct tone than the alternating current heretofore employed without making the other wires in the cable noisy.

My invention comprehends the various novel features of construction and arrange- 5 ment hereinafter more particularly described and claimed.

In the accompanying drawings, Figure I is a plan view of an organized apparatus embodying my invention 1 Fig. II is a vertical 9o sectional view of said apparatus, taken on the line II II in Fig. I. FigrIII is a plan View of the casing and an inverted plan of the casing-lid shown in Figs. I and II. Fig. IV is a diagram showing a convenient arrangement of the wiring connections of said apparatus. Fig. V is a diagram showing a modiswitch) includes a variable number of the batiied arrangement of the wiring connections of said apparatus.

In said figures, 1 is the lnclosing casing,

iJGU -COllS 5, so as to deliver a current upon the c1rcu1t35 36 withoutproducing a continuous sound or tone therein, the presence of comprising the removable lid 2 and conventhe testing-current being manifested simply 7 iently portable by the strap-handle 3. Said by a click in a telephone-receiver when the casing 1 incloses both the generator consisttested circuit is connected therewith. ing of the plurality of battery-cells 5 and the In the arrangement shown in F ig. IV the condenser 7. number of cells 5 in connection with both Conveniently mounted upon the under side pairs of terminals is variable by means of the 75 of the lid 2 is the combined transformer and switch-lever 22, and ordinarily the respective automatic circuit-breaker 9, provided with the circuits to be tested would not be connected primary terminals 11 12 and the secondary to said terminals at the same time, as interminals 131 1. Said transformer comprises dicatcd. However, as shown in Fig. II, enthe primary coil 16 and the secondary coil 17, tirely-se 'iarate groups of cells 5 are connected 30 which coilsareconvenientlydivided,asshown with the respective pairs of terminals, the in Fig. 1V, and provided with the U-shaped conductor 37 being disconnected from the core 18, whose poles are opposed to the osswitch-fulcrum 23 and being directly concillatory armature 19, which is pivoted at 20. nected with the battery, as indicated in Fig.

Upon the casing-lid 2 is mounted the switch- V, wherein the conductor 37 is provided with 5 lever 22, which is arranged to oscillate upon a switch 26 for making and breaking the conthe center 23 and to successively make connection when desired. tact with a plurality of terminals 24, respec- The apparatus above described maybe used tively connected to individual battery-cells 5. for tone-testing a telephone-cable, as follows: As best shown in Fig. IV, said cells 5 are The apparatus being taken to the manhole or 9 connected by the circuit 25 with the primary coil 16, and said circuit includes the armature 19, switch-terminal 21, and switch-lever 22 so that in accordance with the position of the other tem1. orary testing-station, (indicated at 4:0 in Fig. IV,) the tester calls up the operator at the excluinge-station -11 on any working wire and gives notice that he is ready to switch-lever 22 avariable number of said cells test the cable 13, comprising, say, three hun- 95 may be included in circuit with said coil 16. dred pairs of wires. The tester then connects It is to be understood that the arrangement his apparatus with any pair on the cable and,

is such that when said coil 16 is energized by if it is an idle pair, continues speech comany desired number of said cells the armamunication with the exchange operator ture 19 is vibrated, so as to automatically through the same, but if it busy he pre- 100 make and break said primary circuit 25. ceeds until an idle pair is found. Communi- The secondary coil 17 of the transformer 9 cation for speech may then be established is connected by the secondary circuit 27 with through the cable and by ground connection the terminals 28 and 29, mounted upon the at the testing-station and at the exchangecasing-lid 2, and the condenser 7 is included station, it being noted, with reference to Fig. 5

in said circuit 27. Said terminals 28 and 29 TV, that by a ground connection 12 made at are adapted to detachably connect with the the exchange-station, the tone-producingapexternal circuit 30 31, which is to be tested, paratus may be short-circuited, as indicated,

and it is to be understood that the operation so as to suppress the tone with respect to the of the device is such that the vibrations of metallic circuit. The tester then iiroceedsto I10 the armature 19, making and breaking the primary circuit 25, induce a corresponding pulsatorycurrent in the secondary circuit, including the exterior circuit 30, which is to connect the testing apparatus with each of the pairs in the cable in succession, and as connection is made with each pair the operator at the exchange-station ascertains by the be tested, and thus produce a peculiar sound tone which pair is thus connected and reports 1 5 or tone in said exterior circuit. The switchthe number of that pair to the tester in the lever 22 is utilized to include only so many manhole, who is thus enabled to identify the of the battery-cells 5 as sufiice to produce the same. desired tone without disturbing other circuits it is to be understood that the condenser 7 adjoining the particular circuit selected for so modifies the currentfrom the testing-gen- 120 the test, the current being thus increased or erator as to prevent the accidental operation decreased in accordance with the length and of the telephone signaling devices in the exresistance of the circuit being tested. change-station by said current that is to say,

A second pair of terminals 33 34 are mount- (with reference to Fig. lV,) when the switched upon the lid 2 and adapted to detachably lever 22 is in contact with any one of the ter- 5 connect with an exterior circuit 35 36 to be minals 21 the current in the primary circuit tested. The circuit 37 38, extending from is direct and pulsatory, whereas the current said terminals 33 34 within the casing 1, ininduced in the secondary circuit (including eludes the switch 22, as shown in Fig. IV, the tested line 30 31 and comprising both inand (in accordance with the position of said ductive resistance and capacity) has the char- 3 acteristics of an alternating current, incapable o'foperatingthe subscribers annunciatorsignal atthe exchange-station.

I do not desire to limit myself to the precise details of construction shown and described, as it is obvious that various modifica-' terior to said casing, todetachably connect said secondary circuit, with the circuit to be tested including separate and distinct terminals for the primary and secondary circuits, substantially as set forth.

2. In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing; of a generator within said casing; a transformer, comprising a primary and a secondary coil within said casing; a primary circuit including said generator and said primary coil; means to automatically make and break said primary circuit; a condenser within said casing; a secondary circuit, separate from said primary circuit and including said secondary coil; and, means exterior to said casing to detachably connect said secondary circuit with the circuit to be tested including separate and distinct terminals for the primary and secondary circuits, substantially as set forth.

3. In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing; of a generator within said casing; means to vary the current from said generator; a transformer comprising primary and secondary coils within said casing; a primary circuitincluding said generator and said primary coil; means to automatically make and break said primary circuit; a secondary circuit separate from said primary circuit and includingsaid secondary coil, and, means exterior to said casing to detachably connect said secondary circuit with the circuit which is to be tested including separate and distinct terminals for the primary and secondary circuits, substantially as set forth.

4, In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing; of a generator within said casing; a transformer comprising concentric primary and secondary coils within said casing; a primary circuit including said generator and said primary coil;

an oscillatory armature, local to said transformer, included in said primary circuit, and arranged to automatically make and break the latter; a secondary circuit separate from said primary circuit and including said secondary coil; and, 'means, exterior to said casing, to detachably connect said secondary circuit with the circuit to be tested including separate and distinct terminals for the primary and secondary circuits, substantially as set forth.

5. In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing; .of a batterycell detachably mounted within said casing; a transformer, comprising a primary coil and a secondary coil within said casing; a primary circuit connecting said battery and said primary coil; an oscillatory armature for said transformer, included in said primary circuit and arranged to automatically make and break the latter; a secondary circuit separate from said primary circuit and including said secondary coil; and. means exterior to said casing, to detachably connect said secondary circuit with the circuit to be tested including separate and distinct terminals for the primary and secondary circuits, substantially as set forth.

6; In a portable device constructed and arranged for testing electric circuits, the combination withan inclosing casing; 'of a battery within said casing, comprising a plurality of cells; a transformer, comprising a primary coil and a secondary coil within said casing; a primary circuit connecting said battery and said primary coil; means to vary the number of battery-cells included in said primary circuit; a movable armature for said transformer, included in said primary circuit and arranged to make and break the latter; a secondary circuit separate from said primary circuit and including said secondary coil; and, means exterior to said casing, to detachably connect said secondary circuit with the circuit to be. tested, substantially as set forth.

7.v In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing comprising a removable lid; of a battery, comprising a plurality of cells within said casing; a condenser within said casing; a transformer, comprising primary and secondary coils within saidcass ing; a primary-circuit connecting said battery and said primary coil; a switch mounted upon the exterior of said casing and arranged to vary the number of battery-cells included in said primary circuit; a movable armaturefor said transformer, included in said primary circuit and arranged to automatically make and break the latter; a secondary circuit, separate from said primary circuit and including said secondary coil and said condenser; a pair of terminals for said secondary circuit, mounted upon the exterior of said casing and arranged to detachably connect with a circuit to be tested; a second pair of terminals, upon the exterior of said casing, arranged to detachably connect with a circuit to be tested; and, circuit connections within said casing extending from the last-named terminals to said battery, substantially as set forth.

8. In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing; of two pairs of terminals mounted upon said casing and respectively arranged to detachably connect with circuits to be tested; a generator within said casing; circuit connections between said generator and both pairs of said terminals;

means, within said casing, to supply one pair of terminals witha secondary currentinduced from said generator and having characteristics of an alternating current; and, means, within said casing, to supply the other pair of said terminals with a direct current from said generator, substantially as set forth.

9. In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing; of two pairs of terminals mounted upon said casing and respectively arranged to detachably connect said circuits to be tested; a generator within said casing; circuit connections between said generator and both pairs of said terminals; means within said casing to supply one pair of terminals with a secondary currentinduced from said generator and having characteristics of an alternating current; means within said casing to supply the other pair of said terminals with a direct current from said generator; and, a switch carried by said casing arranged to control the connections between said terminals and said generator, substantially as set forth.

10. In a portable device constructed and arranged for testing electric circuits, the combination with an inclosing casing; of two pairs of terminals mounted upon said casing and respectively arranged to detachably connect with circuits to be tested; of a generator within said casing; a condenser within said casing; interlinking primary and secondary circuit connections between said generator and one pair of said terminals, including said condenser in the secondary circuit; and, primary circuit connections between said generator and the second pair of said terminals; whereby said first pair of terminals are supplied with a secondary current induced from said generator and having characteristics of an alternating current, and, said second pair of terminals are supplied with a direct current from said generator, substantially as set forth.

In testimony whereof I have hereunto signed my name, at Philadelphia, Pennsylvania, this 13th day of November, 1902.

WILLIAM JOSEPH KYLE.

Witnesses:

JAMES H. BELL, M. KATIE TRUMBORE. 

